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8/10/2019 Titrasi CA EDTA
1/2
0
1
2
3
4
5
6
7
8
9
0 5 10 15 20 25 30 35
pCa
pCa
8/10/2019 Titrasi CA EDTA
2/2
Misal
Titrasi 25 mL Ca2+ 0.05 M
dengan EDTA 0.05 M pada pH= 9
Kf-CaY2-= 5.00E+10
alfaY4- pada pH 9= 0.041
Kf' CaY2-= 2.05E+09
Vol EDTA mmol EDTA mmol Ca2 [Ca2+] pCa [EDTA]excess [CaY2-]
0 0 1.25 0.05 1.30103
1 0.05 1.2 0.046153846 1.335792
5 0.25 1 0.033333333 1.477121
10 0.5 0.75 0.021428571 1.669007
15 0.75 0.5 0.0125 1.90309
20 1 0.25 0.005555556 2.255273
24 1.2 0.05 0.001020408 2.991226
24.2 1.21 0.04 0.000813008 3.089905
24.4 1.22 0.03 0.000607287 3.216606
24.6 1.23 0.02 0.000403226 3.394452
24.8 1.24 0.01 0.000200803 3.697229
25 1.25 3.49215E-06 5.456907 [CaY2-]= 0.025
25.2 1.26 6.10E-08 7.214844 0.000199 0.0249
25.4 1.27 3.07E-08 7.512413 0.000397 0.025
25.6 1.28 2.07E-08 7.685071 0.000593 0.025099
25.8 1.29 1.56E-08 7.806604 0.000787 0.025197
26 1.3 1.26E-08 7.900134 0.00098 0.025294
27 1.35 6.34E-09 8.197811 0.001923 0.025
28 1.4 4.39E-09 8.357511 0.00283 0.02547229 1.45 3.41E-09 8.466656 0.003704 0.025926
30 1.5 2.83E-09 8.548326 0.004545 0.026364